A triple-arm, randomized, simple-blinded clinical trial will be conducted. A control sequence and an intervention sequence of three subgroups with different exposure levels to the simulation program are proposed. Group 1: open abdominal aortic repair (AAOR), Group 2: vascular anastomosis (VA) and AAOR, and Group 3: specific micro-surgical skills, VA and AAOR. Surgical residents of general, vascular, or cardiovascular surgery programs will be included. Sample size calculation resulted in 45 participants, 15 in each group. Simple blinding will involve external evaluators. Randomization will occur as a simple randomization.

Inclusion Criteria:

• Vascular Surgery, Cardiothoracic Surgery, and General Surgery residents.
• Over 18 years old.

Exclusion Criteria:

• Serious illnesses, such as advanced cancer, decompensated cardiovascular diseases, or severe neurological disorders, could be exclusion criteria due to concerns about the participant's safety and ability to complete the study.
• Participants who have known allergies to components of the interventions or have experienced severe adverse reactions in the past will be excluded from the study.
• Any medical condition that could interfere with the participant's ability to complete assessments or follow study guidelines could be a reason for exclusion. This could include, for example, severe physical disabilities or illnesses requiring continuous hospitalization.
• Individuals who cannot provide valid informed consent due to cognitive issues, mental impairment, or legal incapacity will be excluded from the study.
• Individuals who have had prior exposure to structured simulation programs in vascular surgery will be excluded. Previous familiarity with simulation could influence study outcomes, introducing a prior learning bias that could distort the assessment of the intervention's effectiveness.

The data may not be available for public access due to participant privacy concerns but may be available from the corresponding author upon reasonable request.

Evaluators, who are external to the researchers, will be single-blinded to assess the effectiveness of different interventions. They will remain unaware of the participants' group assignments. Privacy will be maintained through coding and presenting de-identified data. Data will also be presented without voices, glove usage, and image distortion to prevent identification of personal details such as gender, race, or other characteristics.